exists=true or false

Indicates whether or file is expected to exist already. If true, IsWritable assumes file exists and will return an error if it does not. If false, IsWritable returns true or false depending on whether the user has rights to write to file, whether or not it exists. The default value is true.

The IsWritable(file) command returns true if the user has write permission for the specified file.  If the user does not, false is returned.

If the file does not exist or an invalid file descriptor is passed, an exception is raised.

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{WriteFile}\right]\left(''file''\,''data''\right)$

$4$

$\mathrm{FileTools}\left[\mathrm{IsWritable}\right]\left(''file''\right)$

$\mathrm{true}$

$\mathrm{FileTools}\left[\mathrm{Remove}\right]\left(''file''\right)$